Recently I started feeling a pain deep inside the walls of my vagina during intercourse. It started as a little area of the wall so it was painful if it was touched during intercourse, but I could still have sex in other positions where this part was untouched. However, now the pain has spread to the whole wall and to some of the opening of my vagina, and I cannot have intercourse at all anymore due to the pain. It doesn't look any different and stops hurting around an hour or so afterwards.

You make an appointment with your Gynecologist and discuse it with them... they will examine you and make determinations and recommendations.